<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // var num1 = 100;
        // num1 = num1+200;
        // alert(num1);

        // += -= *= /= %= **=

        // + - * / % **
        var num1 = 100;
        num1 += 200; // num1 = num1+200; 300
        num1 -= 200; // num1 = num1-200; 100

        num1 *= 200; // num1 = num1*200; 20000

        num1 /= 200; // num1 = num1/200; 100

        num1 %= 200; // num1 = num1%200; 100 

        num1 **= 2; // num1 = num1**2; 10000
        console.log(num1);

    </script>
</body>
</html>